(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Publishing Venue

Related People

Abstract

Many of today's library systems have dual-gripper pickers which allow the autochanger to exchange cartridges at a location in a library. This results in higher pick performance than using individual move commands. In most cases, when one of the two grippers fail, the autochanger reports a hard failure and the library stops operating even though the second gripper may still be usable. And, since there are usually more failure points in a dual-gripper picker than in a single-gripper picker, this can result in a dual-gripper picker being less reliable than a single-gripper picker. What is needed is to maintain the performance benefits of a dual-gripper picker while improving the reliability to be equal to or better than the reliability/availability of a single-gripper picker mechanism.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
16% of the total text.

Error Recovery Scenarios for Dual-Gripper Pickers in
Libraries

Many of
today's library systems have dual-gripper pickers which
allow the autochanger to exchange cartridges at a location in a
library. This results in higher pick
performance than using
individual move commands. In most cases,
when one of the two
grippers fail, the autochanger reports a hard failure and the library
stops operating even though the second gripper may still be usable.
And, since there are usually more failure points in a dual-gripper
picker than in a single-gripper picker, this can result in a
dual-gripper picker being less reliable than a single-gripper picker.
What is needed is to maintain the performance benefits of a
dual-gripper picker while improving the reliability to be equal to or
better than the reliability/availability of a single-gripper picker
mechanism. This can be done with an
error recovery strategy for a
dual-gripper picker so that if a failure affects one gripper, the
autochanger can continue to operate using the other gripper by
emulating a single-gripper picker.

The SCSI
EXCHANGE MEDIUM command uses a source, a first
destination, and a second destination. A
cartridge is moved from the
source to the first destination, and the cartridge that was in the
first destination is moved to the second destination.

An EXCHANGE MEDIUM command sequence using a dual gripper
picker is as
follows:
1.
position gripper 1 at the source
2.
pick cartridge 1 from the source location into gripper 1
3.
position gripper 2 at the first destination
4.
pick cartridge 2 into gripper 2
5.
position gripper 1 at the first destination
6.
put cartridge 1 into the first destination
7.
position gripper 2 at the second destination
8.
put cartridge 2 into the second destination

An EXCHANGE MEDIUM command sequence using a
single-gripper picker is
as follows:
1.
position the gripper at the first destination
2.
pick cartridge 2 into the gripper
3.
position the gripper at the second destination
4.
put cartridge 2 into the second destination
5.
position the gripper at the source
6.
pick cartridge 1 into the gripper
7.
position the gripper at the first destination
8.
put cartridge 1 into the first destination

In the
single-gripper implementation putting cartridge 1 into
the first destination is the last action taken.
In the dual-gripper
implementation putting cartridge 1 into the first destination happens
earlier in the sequence. Since the first
destination is typically a
drive, the dual-gripper implementation makes the cartridge available
for read/write operations sooner.

What is
needed is an error recovery strategy for a dual-gripper
picker so that if a failure affects one gripper, the autochanger can
continue to operate using the other gripper by emulating a
single-gripper picker. While emulating a
single-gripper picker will
lose the performance benef...